package com.big.common.utils;

import java.net.InetAddress;
import java.util.UUID;

public class UUIDGenerator {


    public  static  String  getUUID7(){
        int hashCode = java.util.UUID.randomUUID().toString().hashCode();
        if (hashCode <0){
            hashCode=-hashCode;
        }
        // 0 代表前面补充0
        // 10 代表长度为10
        // d 代表参数为正数型
        String format = String.format("%010d", hashCode).substring(0,7);
        return  format;
    }
    public  static  String  getUUID9(){
        int hashCode = java.util.UUID.randomUUID().toString().hashCode();
        if (hashCode <0){
            hashCode=-hashCode;
        }
        // 0 代表前面补充0
        // 10 代表长度为10
        // d 代表参数为正数型
        String format = String.format("%010d", hashCode).substring(0,9);
        return  format;
    }
    /**
     * 产生一个唯一Long数字类型的ID
     * @return
     */
    public static Long getUUIDInOrderId(){
        Integer orderId1= generate().hashCode();
        Integer orderId2= UUID.randomUUID().toString().replace("-","").hashCode();
        StringBuilder sb =  new StringBuilder().append((orderId1 < 0 ? -orderId1 : orderId1)).append((orderId2 < 0 ? -orderId2 : orderId2));
        return Long.valueOf(sb.toString());
    }
    public static String getStringUUIDInOrderId(){
        Integer orderId1= generate().hashCode();
        Integer orderId2= UUID.randomUUID().toString().replace("-","").hashCode();
        StringBuilder sb =  new StringBuilder().append((orderId1 < 0 ? -orderId1 : orderId1)).append((orderId2 < 0 ? -orderId2 : orderId2));
        return sb.toString();
    }
    /**
     * 产生一个32位的UUID
     *
     * @return
     */
    public static String generate() {
        return new StringBuilder(32).append(format(getIP())).append(
                format(getJVM())).append(format(getHiTime())).append(
                format(getLoTime())).append(format(getCount())).toString();

    }

    private static final int IP;
    static {
        int ipadd;
        try {
            ipadd = toInt(InetAddress.getLocalHost().getAddress());
        } catch (Exception e) {
            ipadd = 0;
        }
        IP = ipadd;
    }

    private static short counter = (short) 0;

    private static final int JVM = (int) (System.currentTimeMillis() >>> 8);

    private final static String format(int intval) {
        String formatted = Integer.toHexString(intval);
        StringBuilder buf = new StringBuilder("00000000");
        buf.replace(8 - formatted.length(), 8, formatted);
        return buf.toString();
    }

    private final static String format(short shortval) {
        String formatted = Integer.toHexString(shortval);
        StringBuilder buf = new StringBuilder("0000");
        buf.replace(4 - formatted.length(), 4, formatted);
        return buf.toString();
    }

    private final static int getJVM() {
        return JVM;
    }

    private final static short getCount() {
        synchronized (UUIDGenerator.class) {
            if (counter < 0) {
                counter = 0;
            }
            return counter++;
        }
    }

    /**
     * Unique in a local network
     */
    private final static int getIP() {
        return IP;
    }

    /**
     * Unique down to millisecond
     */
    private final static short getHiTime() {
        return (short) (System.currentTimeMillis() >>> 32);
    }

    private final static int getLoTime() {
        return (int) System.currentTimeMillis();
    }

    private final static int toInt(byte[] bytes) {
        int result = 0;
        for (int i = 0; i < 4; i++) {
            result = (result << 8) - Byte.MIN_VALUE + (int) bytes[i];
        }
        return result;
    }


    /**
     * 测试
     */
    public static void main(String[] args) {
        /**
         * 商品开头911
         * 用户开头511 或者512
         * 订单开头210
         *
         */
//      System.out.println("911"+getUUID7());
        System.out.println("512"+getUUID7());
    }

}
